On Fri, 22 Apr 2011, AnnyRen wrote:
> Hi,
>
> I'm testing MDS expasion,
> my original environment has 3 MON, 2 MDS (one active, one standby), 10
> OSD which are built on 15 physical machines.
>
> the following is my step to test add/remove active MDS:
>
>
> Step1: check mds status
>
> root@MON1:~# ceph mds dump -o -
> 4097: 192.168.200.184:6800/2095 '0' mds0.1 up:active seq 66
> 4107: 192.168.200.185:6800/1911 '1' mds-1.0 up:standby seq 2
> There are two mds, one is active, another is standby
>
> Step2: ceph mds set_max_mds 2
>
> Step3: ceph -s
> 2011-04-22 08:33:03.836554 mds e18: 2/2/2 up {0=up:active,1=up:active}
>
> or
> root@MON1:~# ceph mds dump -o -
> max_mds 2
> in 0,1
> up {0=4097,1=4107}
> failed
> stopped
> 4097: 192.168.200.184:6800/2095 '0' mds0.1 up:active seq 66
> 4107: 192.168.200.185:6800/1911 '1' mds1.1 up:active seq 25635
>
>
> Step4: I want to set one mds to standby, so I execute "ceph mds set_max_mds 1"
>
> root@MON1:~# ceph mds set_max_mds 1
> 2011-04-22 08:35:29.964667 mon <- [mds,set_max_mds,1]
> 2011-04-22 08:35:30.133274 mon0 -> 'max_mds = 1' (0)
>
>
> Step5: Then I check mds status
>
> root@MON1:~# ceph mds stat
> 2011-04-22 08:39:04.160139 mon <- [mds,stat]
> 2011-04-22 08:39:04.160823 mon0 -> 'e19: 2/2/1 up {0=up:active,1=up:active}' (0)
> ^^^^^^
> What does the 2/2/1 means ?
>
> I found that the number of active MDS still remains two...
> Could you tell me how to reduce the active mds number from 2 to 1...?
> and what the 2/2/1 means ?
2 are "up", 2 are "in" (the cluster set includes 2), and 1 is the
target/max.
You can do
$ ceph mds stop 1
to tell mds1 to export everything and shut down cleanly.
sage
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